Disappears just below the surface of the ground, with only its unobtrusive “chimney” port peeking up. Constructed of high-density polyethylene these subwoofers can withstand flooding rains and wild temperature extremes, and have been successfully tested underwater and in environments from -20°F to 185°F. The subwoofer’s low-heat design is vented through the “chimney,” providing a constant flow of fresh air while always protecting the system from harsh weather and water. The flared chimney port system, combined with a high-intensity magnet structure, thumps out deep, musical bass without chuffing or extraneous vibration. Bury the subwoofer nearby, or install it under your decking, and rock the very ground beneath your feet!